- 1(current)
Q. No.Of the radiations/particle beams mentioned below, which one causes maximum ionisation when passing through matter?
1. neutron beam
2. \(\beta\)-rays
3. \(\gamma \)-rays
4. infra-red light
1. neutron beam
2. \(\beta\)-rays
3. \(\gamma \)-rays
4. infra-red light
Subtopic: Â Types of Decay |
Level 3: 35%-60%
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Tritium is an isotope of hydrogen whose nucleus triton contains \(2\) neutrons and \(1\) proton. Free neutrons decay into\(p+e^{-1}+\nu^{-1}.\) If one of the neutrons in Triton decays, it would transform into \(\mathrm{He}^{3}\) nucleus. This does not happen. This is because:
| 1. | triton energy is less than that of a \(\mathrm{He}^{3}\) nucleus. |
| 2. | the electron created in the beta decay process cannot remain in the nucleus. |
| 3. | both the neutrons in Triton have to decay simultaneously resulting in a nucleus with \(3\) protons, which is not a \(\mathrm{He}^{3}.\) nucleus. |
| 4. | free neutrons decay due to external perturbations which is absent in the Triton nucleus. |
Subtopic: Â Types of Decay |
Level 3: 35%-60%
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Which, of the following particles, is least absorbed by matter (i.e., interacts least) as it passes through?
1. \(\alpha\)-rays
2. \(\beta\)-rays
3. \(\gamma\)-rays
4. neutrinos
1. \(\alpha\)-rays
2. \(\beta\)-rays
3. \(\gamma\)-rays
4. neutrinos
Subtopic: Â Types of Decay |
Level 3: 35%-60%
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During a \(\beta\)-decay, fast electrons are found to have been emitted. These electrons come from:
| 1. | the outermost atomic shell |
| 2. | the innermost atomic shell |
| 3. | the conduction band |
| 4. | the nucleus |
Subtopic: Â Types of Decay |
Level 3: 35%-60%
Hints
In a nuclear reaction, which of the following, is not necessarily conserved?
1. Number of neutrons
2. Number of protons
3. Number of electrons
4. All of the above
1. Number of neutrons
2. Number of protons
3. Number of electrons
4. All of the above
Subtopic: Â Types of Decay |
 66%
Level 2: 60%+
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- 1(current)
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